I am having a problem. Before PTCL DSL, i was using comsats dialup on server. with 10 workstations. the setting of the LAN card is as follows

IP address: 172.16.0.1

subnet mask: 255.255.0.0

default gateway: 172.16.0.1

this LAN card is still installed. I bought another LAN card for PTCL DSL. The PTCL guy configured the card as follows

IP address: 192.168.1.13

subnet mask: 255.255.255.0

default gateway: 192.168.1.1

preffered DNS server: 203.99.163.240

alternate DNS server: 203.135.0.70

Now I have two LAN cards on server, one for local area network and other for PTCL DSL. Now the problem is after sometime DSL connection stops. when I disable local area network, DSL connection starts again. after few minutes dsl again stops, again i have to disable local area network.